drivers/scsi/cxgb3i/cxgb3i_iscsi.c

   1 /* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
   2  *
   3  * Copyright (c) 2008 Chelsio Communications, Inc.
   4  * Copyright (c) 2008 Mike Christie
   5  * Copyright (c) 2008 Red Hat, Inc.  All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation.
  10  *
  11  * Written by: Karen Xie (kxie@chelsio.com)
  12  */
  13
  14 #include <linux/inet.h>
  15 #include <linux/slab.h>
  16 #include <linux/crypto.h>
  17 #include <linux/if_vlan.h>
  18 #include <net/dst.h>
  19 #include <net/tcp.h>
  20 #include <scsi/scsi_cmnd.h>
  21 #include <scsi/scsi_device.h>
  22 #include <scsi/scsi_eh.h>
  23 #include <scsi/scsi_host.h>
  24 #include <scsi/scsi.h>
  25 #include <scsi/iscsi_proto.h>
  26 #include <scsi/libiscsi.h>
  27 #include <scsi/scsi_transport_iscsi.h>
  28
  29 #include "cxgb3i.h"
  30 #include "cxgb3i_pdu.h"
  31
  32 #ifdef __DEBUG_CXGB3I_TAG__
  33 #define cxgb3i_tag_debug        cxgb3i_log_debug
  34 #else
  35 #define cxgb3i_tag_debug(fmt...)
  36 #endif
  37
  38 #ifdef __DEBUG_CXGB3I_API__
  39 #define cxgb3i_api_debug        cxgb3i_log_debug
  40 #else
  41 #define cxgb3i_api_debug(fmt...)
  42 #endif
  43
  44 /*
  45  * align pdu size to multiple of 512 for better performance
  46  */
  47 #define align_pdu_size(n) do { n = (n) & (~511); } while (0)
  48
  49 static struct scsi_transport_template *cxgb3i_scsi_transport;
  50 static struct scsi_host_template cxgb3i_host_template;
  51 static struct iscsi_transport cxgb3i_iscsi_transport;
  52 static unsigned char sw_tag_idx_bits;
  53 static unsigned char sw_tag_age_bits;
  54
  55 static LIST_HEAD(cxgb3i_snic_list);
  56 static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
  57
  58 /**
  59  * cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
  60  * @tdev: t3cdev pointer
  61  */
  62 struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
  63 {
  64         struct cxgb3i_adapter *snic;
  65
  66         read_lock(&cxgb3i_snic_rwlock);
  67         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
  68                 if (snic->tdev == tdev) {
  69                         read_unlock(&cxgb3i_snic_rwlock);
  70                         return snic;
  71                 }
  72         }
  73         read_unlock(&cxgb3i_snic_rwlock);
  74         return NULL;
  75 }
  76
  77 static inline int adapter_update(struct cxgb3i_adapter *snic)
  78 {
  79         cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
  80                         snic, snic->tdev);
  81         return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
  82                                         &snic->tx_max_size,
  83                                         &snic->rx_max_size);
  84 }
  85
  86 static int adapter_add(struct cxgb3i_adapter *snic)
  87 {
  88         struct t3cdev *t3dev = snic->tdev;
  89         struct adapter *adapter = tdev2adap(t3dev);
  90         int i, err;
  91
  92         snic->pdev = adapter->pdev;
  93         snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
  94
  95         err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
  96                                     &snic->tx_max_size,
  97                                     &snic->rx_max_size);
  98         if (err < 0)
  99                 return err;
 100
 101         for_each_port(adapter, i) {
 102                 snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
 103                 if (!snic->hba[i])
 104                         return -EINVAL;
 105         }
 106         snic->hba_cnt = adapter->params.nports;
 107
 108         /* add to the list */
 109         write_lock(&cxgb3i_snic_rwlock);
 110         list_add_tail(&snic->list_head, &cxgb3i_snic_list);
 111         write_unlock(&cxgb3i_snic_rwlock);
 112
 113         cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
 114                         t3dev, snic, snic->hba_cnt);
 115         return 0;
 116 }
 117
 118 /**
 119  * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
 120  * @t3dev: t3cdev adapter
 121  */
 122 void cxgb3i_adapter_open(struct t3cdev *t3dev)
 123 {
 124         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
 125         int err;
 126
 127         if (snic)
 128                 err = adapter_update(snic);
 129         else {
 130                 snic = kzalloc(sizeof(*snic), GFP_KERNEL);
 131                 if (snic) {
 132                         spin_lock_init(&snic->lock);
 133                         snic->tdev = t3dev;
 134                         err = adapter_add(snic);
 135                 } else
 136                         err = -ENOMEM;
 137         }
 138
 139         if (err < 0) {
 140                 cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
 141                                 snic, snic ? snic->flags : 0, t3dev, err);
 142                 if (snic) {
 143                         snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
 144                         cxgb3i_adapter_close(t3dev);
 145                 }
 146         }
 147 }
 148
 149 /**
 150  * cxgb3i_adapter_close - release the resources held and cleanup h/w settings
 151  * @t3dev: t3cdev adapter
 152  */
 153 void cxgb3i_adapter_close(struct t3cdev *t3dev)
 154 {
 155         struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
 156         int i;
 157
 158         if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
 159                 cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
 160                                 t3dev, snic, snic ? snic->flags : 0);
 161                 return;
 162         }
 163
 164         /* remove from the list */
 165         write_lock(&cxgb3i_snic_rwlock);
 166         list_del(&snic->list_head);
 167         write_unlock(&cxgb3i_snic_rwlock);
 168
 169         for (i = 0; i < snic->hba_cnt; i++) {
 170                 if (snic->hba[i]) {
 171                         cxgb3i_hba_host_remove(snic->hba[i]);
 172                         snic->hba[i] = NULL;
 173                 }
 174         }
 175         cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
 176                         t3dev, snic, snic->hba_cnt);
 177         kfree(snic);
 178 }
 179
 180 /**
 181  * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
 182  * @t3dev: t3cdev adapter
 183  */
 184 static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
 185 {
 186         struct cxgb3i_adapter *snic;
 187         int i;
 188
 189         if (ndev->priv_flags & IFF_802_1Q_VLAN)
 190                 ndev = vlan_dev_real_dev(ndev);
 191
 192         read_lock(&cxgb3i_snic_rwlock);
 193         list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
 194                 for (i = 0; i < snic->hba_cnt; i++) {
 195                         if (snic->hba[i]->ndev == ndev) {
 196                                 read_unlock(&cxgb3i_snic_rwlock);
 197                                 return snic->hba[i];
 198                         }
 199                 }
 200         }
 201         read_unlock(&cxgb3i_snic_rwlock);
 202         return NULL;
 203 }
 204
 205 /**
 206  * cxgb3i_hba_host_add - register a new host with scsi/iscsi
 207  * @snic: the cxgb3i adapter
 208  * @ndev: associated net_device
 209  */
 210 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
 211                                        struct net_device *ndev)
 212 {
 213         struct cxgb3i_hba *hba;
 214         struct Scsi_Host *shost;
 215         int err;
 216
 217         shost = iscsi_host_alloc(&cxgb3i_host_template,
 218                                  sizeof(struct cxgb3i_hba), 1);
 219         if (!shost) {
 220                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
 221                                 snic, ndev);
 222                 return NULL;
 223         }
 224
 225         shost->transportt = cxgb3i_scsi_transport;
 226         shost->max_lun = CXGB3I_MAX_LUN;
 227         shost->max_id = CXGB3I_MAX_TARGET;
 228         shost->max_channel = 0;
 229         shost->max_cmd_len = 16;
 230
 231         hba = iscsi_host_priv(shost);
 232         hba->snic = snic;
 233         hba->ndev = ndev;
 234         hba->shost = shost;
 235
 236         pci_dev_get(snic->pdev);
 237         err = iscsi_host_add(shost, &snic->pdev->dev);
 238         if (err) {
 239                 cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n",
 240                                 snic, ndev);
 241                 goto pci_dev_put;
 242         }
 243
 244         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 245                          shost, hba, shost->host_no);
 246
 247         return hba;
 248
 249 pci_dev_put:
 250         pci_dev_put(snic->pdev);
 251         scsi_host_put(shost);
 252         return NULL;
 253 }
 254
 255 /**
 256  * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
 257  * @hba: the cxgb3i hba
 258  */
 259 void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
 260 {
 261         cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
 262                          hba->shost, hba, hba->shost->host_no);
 263         iscsi_host_remove(hba->shost);
 264         pci_dev_put(hba->snic->pdev);
 265         iscsi_host_free(hba->shost);
 266 }
 267
 268 /**
 269  * cxgb3i_ep_connect - establish TCP connection to target portal
 270  * @shost:              scsi host to use
 271  * @dst_addr:           target IP address
 272  * @non_blocking:       blocking or non-blocking call
 273  *
 274  * Initiates a TCP/IP connection to the dst_addr
 275  */
 276 static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost,
 277                                                 struct sockaddr *dst_addr,
 278                                                 int non_blocking)
 279 {
 280         struct iscsi_endpoint *ep;
 281         struct cxgb3i_endpoint *cep;
 282         struct cxgb3i_hba *hba = NULL;
 283         struct s3_conn *c3cn = NULL;
 284         int err = 0;
 285
 286         if (shost)
 287                 hba = iscsi_host_priv(shost);
 288
 289         cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
 290
 291         c3cn = cxgb3i_c3cn_create();
 292         if (!c3cn) {
 293                 cxgb3i_log_info("ep connect OOM.\n");
 294                 err = -ENOMEM;
 295                 goto release_conn;
 296         }
 297
 298         err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn,
 299                                  (struct sockaddr_in *)dst_addr);
 300         if (err < 0) {
 301                 cxgb3i_log_info("ep connect failed.\n");
 302                 goto release_conn;
 303         }
 304
 305         hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
 306         if (!hba) {
 307                 err = -ENOSPC;
 308                 cxgb3i_log_info("NOT going through cxgbi device.\n");
 309                 goto release_conn;
 310         }
 311
 312         if (shost && hba != iscsi_host_priv(shost)) {
 313                 err = -ENOSPC;
 314                 cxgb3i_log_info("Could not connect through request host%u\n",
 315                                 shost->host_no);
 316                 goto release_conn;
 317         }
 318
 319         if (c3cn_is_closing(c3cn)) {
 320                 err = -ENOSPC;
 321                 cxgb3i_log_info("ep connect unable to connect.\n");
 322                 goto release_conn;
 323         }
 324
 325         ep = iscsi_create_endpoint(sizeof(*cep));
 326         if (!ep) {
 327                 err = -ENOMEM;
 328                 cxgb3i_log_info("iscsi alloc ep, OOM.\n");
 329                 goto release_conn;
 330         }
 331         cep = ep->dd_data;
 332         cep->c3cn = c3cn;
 333         cep->hba = hba;
 334
 335         cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
 336                           ep, cep, c3cn, hba);
 337         return ep;
 338
 339 release_conn:
 340         cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
 341         if (c3cn)
 342                 cxgb3i_c3cn_release(c3cn);
 343         return ERR_PTR(err);
 344 }
 345
 346 /**
 347  * cxgb3i_ep_poll - polls for TCP connection establishement
 348  * @ep:         TCP connection (endpoint) handle
 349  * @timeout_ms: timeout value in milli secs
 350  *
 351  * polls for TCP connect request to complete
 352  */
 353 static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
 354 {
 355         struct cxgb3i_endpoint *cep = ep->dd_data;
 356         struct s3_conn *c3cn = cep->c3cn;
 357
 358         if (!c3cn_is_established(c3cn))
 359                 return 0;
 360         cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
 361         return 1;
 362 }
 363
 364 /**
 365  * cxgb3i_ep_disconnect - teardown TCP connection
 366  * @ep:         TCP connection (endpoint) handle
 367  *
 368  * teardown TCP connection
 369  */
 370 static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
 371 {
 372         struct cxgb3i_endpoint *cep = ep->dd_data;
 373         struct cxgb3i_conn *cconn = cep->cconn;
 374
 375         cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
 376
 377         if (cconn && cconn->conn) {
 378                 /*
 379                  * stop the xmit path so the xmit_pdu function is
 380                  * not being called
 381                  */
 382                 iscsi_suspend_tx(cconn->conn);
 383
 384                 write_lock_bh(&cep->c3cn->callback_lock);
 385                 cep->c3cn->user_data = NULL;
 386                 cconn->cep = NULL;
 387                 write_unlock_bh(&cep->c3cn->callback_lock);
 388         }
 389
 390         cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
 391                          ep, cep, cep->c3cn);
 392         cxgb3i_c3cn_release(cep->c3cn);
 393         iscsi_destroy_endpoint(ep);
 394 }
 395
 396 /**
 397  * cxgb3i_session_create - create a new iscsi session
 398  * @cmds_max:           max # of commands
 399  * @qdepth:             scsi queue depth
 400  * @initial_cmdsn:      initial iscsi CMDSN for this session
 401  *
 402  * Creates a new iSCSI session
 403  */
 404 static struct iscsi_cls_session *
 405 cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
 406                       u32 initial_cmdsn)
 407 {
 408         struct cxgb3i_endpoint *cep;
 409         struct cxgb3i_hba *hba;
 410         struct Scsi_Host *shost;
 411         struct iscsi_cls_session *cls_session;
 412         struct iscsi_session *session;
 413
 414         if (!ep) {
 415                 cxgb3i_log_error("%s, missing endpoint.\n", __func__);
 416                 return NULL;
 417         }
 418
 419         cep = ep->dd_data;
 420         hba = cep->hba;
 421         shost = hba->shost;
 422         cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
 423         BUG_ON(hba != iscsi_host_priv(shost));
 424
 425         cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
 426                                           cmds_max, 0,
 427                                           sizeof(struct iscsi_tcp_task) +
 428                                           sizeof(struct cxgb3i_task_data),
 429                                           initial_cmdsn, ISCSI_MAX_TARGET);
 430         if (!cls_session)
 431                 return NULL;
 432         session = cls_session->dd_data;
 433         if (iscsi_tcp_r2tpool_alloc(session))
 434                 goto remove_session;
 435
 436         return cls_session;
 437
 438 remove_session:
 439         iscsi_session_teardown(cls_session);
 440         return NULL;
 441 }
 442
 443 /**
 444  * cxgb3i_session_destroy - destroys iscsi session
 445  * @cls_session:        pointer to iscsi cls session
 446  *
 447  * Destroys an iSCSI session instance and releases its all resources held
 448  */
 449 static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
 450 {
 451         cxgb3i_api_debug("sess 0x%p.\n", cls_session);
 452         iscsi_tcp_r2tpool_free(cls_session->dd_data);
 453         iscsi_session_teardown(cls_session);
 454 }
 455
 456 /**
 457  * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
 458  * @conn: iscsi connection
 459  * check the max. xmit pdu payload, reduce it if needed
 460  */
 461 static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
 462
 463 {
 464         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 465         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 466         unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
 467
 468         max = min(cconn->hba->snic->tx_max_size, max);
 469         if (conn->max_xmit_dlength)
 470                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
 471         else
 472                 conn->max_xmit_dlength = max;
 473         align_pdu_size(conn->max_xmit_dlength);
 474         cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
 475                          conn, conn->max_xmit_dlength);
 476         return 0;
 477 }
 478
 479 /**
 480  * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
 481  * @conn: iscsi connection
 482  * return 0 if the value is valid, < 0 otherwise.
 483  */
 484 static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
 485 {
 486         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 487         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 488         unsigned int max = cconn->hba->snic->rx_max_size;
 489
 490         align_pdu_size(max);
 491         if (conn->max_recv_dlength) {
 492                 if (conn->max_recv_dlength > max) {
 493                         cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
 494                                          " Need to be <= %u.\n",
 495                                          conn->max_recv_dlength, max);
 496                         return -EINVAL;
 497                 }
 498                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
 499                 align_pdu_size(conn->max_recv_dlength);
 500         } else
 501                 conn->max_recv_dlength = max;
 502         cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
 503                          conn, conn->max_recv_dlength);
 504         return 0;
 505 }
 506
 507 /**
 508  * cxgb3i_conn_create - create iscsi connection instance
 509  * @cls_session:        pointer to iscsi cls session
 510  * @cid:                iscsi cid
 511  *
 512  * Creates a new iSCSI connection instance for a given session
 513  */
 514 static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
 515                                                  *cls_session, u32 cid)
 516 {
 517         struct iscsi_cls_conn *cls_conn;
 518         struct iscsi_conn *conn;
 519         struct iscsi_tcp_conn *tcp_conn;
 520         struct cxgb3i_conn *cconn;
 521
 522         cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
 523
 524         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
 525         if (!cls_conn)
 526                 return NULL;
 527         conn = cls_conn->dd_data;
 528         tcp_conn = conn->dd_data;
 529         cconn = tcp_conn->dd_data;
 530
 531         cconn->conn = conn;
 532         return cls_conn;
 533 }
 534
 535 /**
 536  * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
 537  * @cls_session:        pointer to iscsi cls session
 538  * @cls_conn:           pointer to iscsi cls conn
 539  * @transport_eph:      64-bit EP handle
 540  * @is_leading:         leading connection on this session?
 541  *
 542  * Binds together an iSCSI session, an iSCSI connection and a
 543  *      TCP connection. This routine returns error code if the TCP
 544  *      connection does not belong on the device iSCSI sess/conn is bound
 545  */
 546
 547 static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
 548                             struct iscsi_cls_conn *cls_conn,
 549                             u64 transport_eph, int is_leading)
 550 {
 551         struct iscsi_conn *conn = cls_conn->dd_data;
 552         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 553         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 554         struct cxgb3i_adapter *snic;
 555         struct iscsi_endpoint *ep;
 556         struct cxgb3i_endpoint *cep;
 557         struct s3_conn *c3cn;
 558         int err;
 559
 560         ep = iscsi_lookup_endpoint(transport_eph);
 561         if (!ep)
 562                 return -EINVAL;
 563
 564         /* setup ddp pagesize */
 565         cep = ep->dd_data;
 566         c3cn = cep->c3cn;
 567         snic = cep->hba->snic;
 568         err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
 569         if (err < 0)
 570                 return err;
 571
 572         cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
 573                          ep, cls_session, cls_conn);
 574
 575         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
 576         if (err)
 577                 return -EINVAL;
 578
 579         /* calculate the tag idx bits needed for this conn based on cmds_max */
 580         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
 581         cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
 582                          conn->session->cmds_max, cconn->task_idx_bits);
 583
 584         read_lock(&c3cn->callback_lock);
 585         c3cn->user_data = conn;
 586         cconn->hba = cep->hba;
 587         cconn->cep = cep;
 588         cep->cconn = cconn;
 589         read_unlock(&c3cn->callback_lock);
 590
 591         cxgb3i_conn_max_xmit_dlength(conn);
 592         cxgb3i_conn_max_recv_dlength(conn);
 593
 594         spin_lock_bh(&conn->session->lock);
 595         sprintf(conn->portal_address, "%pI4", &c3cn->daddr.sin_addr.s_addr);
 596         conn->portal_port = ntohs(c3cn->daddr.sin_port);
 597         spin_unlock_bh(&conn->session->lock);
 598
 599         /* init recv engine */
 600         iscsi_tcp_hdr_recv_prep(tcp_conn);
 601
 602         return 0;
 603 }
 604
 605 /**
 606  * cxgb3i_conn_get_param - return iscsi connection parameter to caller
 607  * @cls_conn:   pointer to iscsi cls conn
 608  * @param:      parameter type identifier
 609  * @buf:        buffer pointer
 610  *
 611  * returns iSCSI connection parameters
 612  */
 613 static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
 614                                  enum iscsi_param param, char *buf)
 615 {
 616         struct iscsi_conn *conn = cls_conn->dd_data;
 617         int len;
 618
 619         cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
 620
 621         switch (param) {
 622         case ISCSI_PARAM_CONN_PORT:
 623                 spin_lock_bh(&conn->session->lock);
 624                 len = sprintf(buf, "%hu\n", conn->portal_port);
 625                 spin_unlock_bh(&conn->session->lock);
 626                 break;
 627         case ISCSI_PARAM_CONN_ADDRESS:
 628                 spin_lock_bh(&conn->session->lock);
 629                 len = sprintf(buf, "%s\n", conn->portal_address);
 630                 spin_unlock_bh(&conn->session->lock);
 631                 break;
 632         default:
 633                 return iscsi_conn_get_param(cls_conn, param, buf);
 634         }
 635
 636         return len;
 637 }
 638
 639 /**
 640  * cxgb3i_conn_set_param - set iscsi connection parameter
 641  * @cls_conn:   pointer to iscsi cls conn
 642  * @param:      parameter type identifier
 643  * @buf:        buffer pointer
 644  * @buflen:     buffer length
 645  *
 646  * set iSCSI connection parameters
 647  */
 648 static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
 649                                  enum iscsi_param param, char *buf, int buflen)
 650 {
 651         struct iscsi_conn *conn = cls_conn->dd_data;
 652         struct iscsi_session *session = conn->session;
 653         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 654         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 655         struct cxgb3i_adapter *snic = cconn->hba->snic;
 656         struct s3_conn *c3cn = cconn->cep->c3cn;
 657         int value, err = 0;
 658
 659         switch (param) {
 660         case ISCSI_PARAM_HDRDGST_EN:
 661                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 662                 if (!err && conn->hdrdgst_en)
 663                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 664                                                         conn->hdrdgst_en,
 665                                                         conn->datadgst_en, 0);
 666                 break;
 667         case ISCSI_PARAM_DATADGST_EN:
 668                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 669                 if (!err && conn->datadgst_en)
 670                         err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
 671                                                         conn->hdrdgst_en,
 672                                                         conn->datadgst_en, 0);
 673                 break;
 674         case ISCSI_PARAM_MAX_R2T:
 675                 sscanf(buf, "%d", &value);
 676                 if (value <= 0 || !is_power_of_2(value))
 677                         return -EINVAL;
 678                 if (session->max_r2t == value)
 679                         break;
 680                 iscsi_tcp_r2tpool_free(session);
 681                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 682                 if (!err && iscsi_tcp_r2tpool_alloc(session))
 683                         return -ENOMEM;
 684         case ISCSI_PARAM_MAX_RECV_DLENGTH:
 685                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 686                 if (!err)
 687                         err = cxgb3i_conn_max_recv_dlength(conn);
 688                 break;
 689         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
 690                 err = iscsi_set_param(cls_conn, param, buf, buflen);
 691                 if (!err)
 692                         err = cxgb3i_conn_max_xmit_dlength(conn);
 693                 break;
 694         default:
 695                 return iscsi_set_param(cls_conn, param, buf, buflen);
 696         }
 697         return err;
 698 }
 699
 700 /**
 701  * cxgb3i_host_set_param - configure host (adapter) related parameters
 702  * @shost:      scsi host pointer
 703  * @param:      parameter type identifier
 704  * @buf:        buffer pointer
 705  */
 706 static int cxgb3i_host_set_param(struct Scsi_Host *shost,
 707                                  enum iscsi_host_param param,
 708                                  char *buf, int buflen)
 709 {
 710         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 711
 712         if (!hba->ndev) {
 713                 shost_printk(KERN_ERR, shost, "Could not set host param. "
 714                              "Netdev for host not set.\n");
 715                 return -ENODEV;
 716         }
 717
 718         cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
 719
 720         switch (param) {
 721         case ISCSI_HOST_PARAM_IPADDRESS:
 722         {
 723                 __be32 addr = in_aton(buf);
 724                 cxgb3i_set_private_ipv4addr(hba->ndev, addr);
 725                 return 0;
 726         }
 727         case ISCSI_HOST_PARAM_HWADDRESS:
 728         case ISCSI_HOST_PARAM_NETDEV_NAME:
 729                 /* ignore */
 730                 return 0;
 731         default:
 732                 return iscsi_host_set_param(shost, param, buf, buflen);
 733         }
 734 }
 735
 736 /**
 737  * cxgb3i_host_get_param - returns host (adapter) related parameters
 738  * @shost:      scsi host pointer
 739  * @param:      parameter type identifier
 740  * @buf:        buffer pointer
 741  */
 742 static int cxgb3i_host_get_param(struct Scsi_Host *shost,
 743                                  enum iscsi_host_param param, char *buf)
 744 {
 745         struct cxgb3i_hba *hba = iscsi_host_priv(shost);
 746         int len = 0;
 747
 748         if (!hba->ndev) {
 749                 shost_printk(KERN_ERR, shost, "Could not set host param. "
 750                              "Netdev for host not set.\n");
 751                 return -ENODEV;
 752         }
 753
 754         cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
 755
 756         switch (param) {
 757         case ISCSI_HOST_PARAM_HWADDRESS:
 758                 len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
 759                 break;
 760         case ISCSI_HOST_PARAM_NETDEV_NAME:
 761                 len = sprintf(buf, "%s\n", hba->ndev->name);
 762                 break;
 763         case ISCSI_HOST_PARAM_IPADDRESS:
 764         {
 765                 __be32 addr;
 766
 767                 addr = cxgb3i_get_private_ipv4addr(hba->ndev);
 768                 len = sprintf(buf, "%pI4", &addr);
 769                 break;
 770         }
 771         default:
 772                 return iscsi_host_get_param(shost, param, buf);
 773         }
 774         return len;
 775 }
 776
 777 /**
 778  * cxgb3i_conn_get_stats - returns iSCSI stats
 779  * @cls_conn:   pointer to iscsi cls conn
 780  * @stats:      pointer to iscsi statistic struct
 781  */
 782 static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
 783                                   struct iscsi_stats *stats)
 784 {
 785         struct iscsi_conn *conn = cls_conn->dd_data;
 786
 787         stats->txdata_octets = conn->txdata_octets;
 788         stats->rxdata_octets = conn->rxdata_octets;
 789         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
 790         stats->dataout_pdus = conn->dataout_pdus_cnt;
 791         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
 792         stats->datain_pdus = conn->datain_pdus_cnt;
 793         stats->r2t_pdus = conn->r2t_pdus_cnt;
 794         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
 795         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
 796         stats->digest_err = 0;
 797         stats->timeout_err = 0;
 798         stats->custom_length = 1;
 799         strcpy(stats->custom[0].desc, "eh_abort_cnt");
 800         stats->custom[0].value = conn->eh_abort_cnt;
 801 }
 802
 803 /**
 804  * cxgb3i_parse_itt - get the idx and age bits from a given tag
 805  * @conn:       iscsi connection
 806  * @itt:        itt tag
 807  * @idx:        task index, filled in by this function
 808  * @age:        session age, filled in by this function
 809  */
 810 static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
 811                              int *idx, int *age)
 812 {
 813         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 814         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 815         struct cxgb3i_adapter *snic = cconn->hba->snic;
 816         u32 tag = ntohl((__force u32) itt);
 817         u32 sw_bits;
 818
 819         sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
 820         if (idx)
 821                 *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
 822         if (age)
 823                 *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
 824
 825         cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
 826                          tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
 827                          age ? *age : 0xFF);
 828 }
 829
 830 /**
 831  * cxgb3i_reserve_itt - generate tag for a give task
 832  * @task: iscsi task
 833  * @hdr_itt: tag, filled in by this function
 834  * Set up ddp for scsi read tasks if possible.
 835  */
 836 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
 837 {
 838         struct scsi_cmnd *sc = task->sc;
 839         struct iscsi_conn *conn = task->conn;
 840         struct iscsi_session *sess = conn->session;
 841         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
 842         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 843         struct cxgb3i_adapter *snic = cconn->hba->snic;
 844         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 845         u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
 846         u32 tag;
 847         int err = -EINVAL;
 848
 849         if (sc &&
 850             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 851             cxgb3i_sw_tag_usable(tformat, sw_tag)) {
 852                 struct s3_conn *c3cn = cconn->cep->c3cn;
 853                 struct cxgb3i_gather_list *gl;
 854
 855                 gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
 856                                         scsi_in(sc)->table.sgl,
 857                                         scsi_in(sc)->table.nents,
 858                                         snic->pdev,
 859                                         GFP_ATOMIC);
 860                 if (gl) {
 861                         tag = sw_tag;
 862                         err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
 863                                                      tformat, &tag,
 864                                                      gl, GFP_ATOMIC);
 865                         if (err < 0)
 866                                 cxgb3i_ddp_release_gl(gl, snic->pdev);
 867                 }
 868         }
 869
 870         if (err < 0)
 871                 tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
 872         /* the itt need to sent in big-endian order */
 873         *hdr_itt = (__force itt_t)htonl(tag);
 874
 875         cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
 876                          tag, *hdr_itt, task->itt, sess->age);
 877         return 0;
 878 }
 879
 880 /**
 881  * cxgb3i_release_itt - release the tag for a given task
 882  * @task:       iscsi task
 883  * @hdr_itt:    tag
 884  * If the tag is a ddp tag, release the ddp setup
 885  */
 886 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
 887 {
 888         struct scsi_cmnd *sc = task->sc;
 889         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
 890         struct cxgb3i_conn *cconn = tcp_conn->dd_data;
 891         struct cxgb3i_adapter *snic = cconn->hba->snic;
 892         struct cxgb3i_tag_format *tformat = &snic->tag_format;
 893         u32 tag = ntohl((__force u32)hdr_itt);
 894
 895         cxgb3i_tag_debug("release tag 0x%x.\n", tag);
 896
 897         if (sc &&
 898             (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
 899             cxgb3i_is_ddp_tag(tformat, tag))
 900                 cxgb3i_ddp_tag_release(snic->tdev, tag);
 901 }
 902
 903 /**
 904  * cxgb3i_host_template -- Scsi_Host_Template structure
 905  *      used when registering with the scsi mid layer
 906  */
 907 static struct scsi_host_template cxgb3i_host_template = {
 908         .module                 = THIS_MODULE,
 909         .name                   = "Chelsio S3xx iSCSI Initiator",
 910         .proc_name              = "cxgb3i",
 911         .queuecommand           = iscsi_queuecommand,
 912         .change_queue_depth     = iscsi_change_queue_depth,
 913         .can_queue              = CXGB3I_SCSI_HOST_QDEPTH,
 914         .sg_tablesize           = SG_ALL,
 915         .max_sectors            = 0xFFFF,
 916         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,
 917         .eh_abort_handler       = iscsi_eh_abort,
 918         .eh_device_reset_handler = iscsi_eh_device_reset,
 919         .eh_target_reset_handler = iscsi_eh_recover_target,
 920         .target_alloc           = iscsi_target_alloc,
 921         .use_clustering         = DISABLE_CLUSTERING,
 922         .this_id                = -1,
 923 };
 924
 925 static struct iscsi_transport cxgb3i_iscsi_transport = {
 926         .owner                  = THIS_MODULE,
 927         .name                   = "cxgb3i",
 928         .caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 929                                 | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 930                                 CAP_PADDING_OFFLOAD,
 931         .param_mask             = ISCSI_MAX_RECV_DLENGTH |
 932                                 ISCSI_MAX_XMIT_DLENGTH |
 933                                 ISCSI_HDRDGST_EN |
 934                                 ISCSI_DATADGST_EN |
 935                                 ISCSI_INITIAL_R2T_EN |
 936                                 ISCSI_MAX_R2T |
 937                                 ISCSI_IMM_DATA_EN |
 938                                 ISCSI_FIRST_BURST |
 939                                 ISCSI_MAX_BURST |
 940                                 ISCSI_PDU_INORDER_EN |
 941                                 ISCSI_DATASEQ_INORDER_EN |
 942                                 ISCSI_ERL |
 943                                 ISCSI_CONN_PORT |
 944                                 ISCSI_CONN_ADDRESS |
 945                                 ISCSI_EXP_STATSN |
 946                                 ISCSI_PERSISTENT_PORT |
 947                                 ISCSI_PERSISTENT_ADDRESS |
 948                                 ISCSI_TARGET_NAME | ISCSI_TPGT |
 949                                 ISCSI_USERNAME | ISCSI_PASSWORD |
 950                                 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 951                                 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 952                                 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
 953                                 ISCSI_PING_TMO | ISCSI_RECV_TMO |
 954                                 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 955         .host_param_mask        = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 956                         ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
 957         .get_host_param         = cxgb3i_host_get_param,
 958         .set_host_param         = cxgb3i_host_set_param,
 959         /* session management */
 960         .create_session         = cxgb3i_session_create,
 961         .destroy_session        = cxgb3i_session_destroy,
 962         .get_session_param      = iscsi_session_get_param,
 963         /* connection management */
 964         .create_conn            = cxgb3i_conn_create,
 965         .bind_conn              = cxgb3i_conn_bind,
 966         .destroy_conn           = iscsi_tcp_conn_teardown,
 967         .start_conn             = iscsi_conn_start,
 968         .stop_conn              = iscsi_conn_stop,
 969         .get_conn_param         = cxgb3i_conn_get_param,
 970         .set_param              = cxgb3i_conn_set_param,
 971         .get_stats              = cxgb3i_conn_get_stats,
 972         /* pdu xmit req. from user space */
 973         .send_pdu               = iscsi_conn_send_pdu,
 974         /* task */
 975         .init_task              = iscsi_tcp_task_init,
 976         .xmit_task              = iscsi_tcp_task_xmit,
 977         .cleanup_task           = cxgb3i_conn_cleanup_task,
 978
 979         /* pdu */
 980         .alloc_pdu              = cxgb3i_conn_alloc_pdu,
 981         .init_pdu               = cxgb3i_conn_init_pdu,
 982         .xmit_pdu               = cxgb3i_conn_xmit_pdu,
 983         .parse_pdu_itt          = cxgb3i_parse_itt,
 984
 985         /* TCP connect/disconnect */
 986         .ep_connect             = cxgb3i_ep_connect,
 987         .ep_poll                = cxgb3i_ep_poll,
 988         .ep_disconnect          = cxgb3i_ep_disconnect,
 989         /* Error recovery timeout call */
 990         .session_recovery_timedout = iscsi_session_recovery_timedout,
 991 };
 992
 993 int cxgb3i_iscsi_init(void)
 994 {
 995         sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
 996         sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
 997         cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
 998                         ISCSI_ITT_MASK, sw_tag_idx_bits,
 999                         ISCSI_AGE_MASK, sw_tag_age_bits);
1000
1001         cxgb3i_scsi_transport =
1002             iscsi_register_transport(&cxgb3i_iscsi_transport);
1003         if (!cxgb3i_scsi_transport) {
1004                 cxgb3i_log_error("Could not register cxgb3i transport.\n");
1005                 return -ENODEV;
1006         }
1007         cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
1008         return 0;
1009 }
1010
1011 void cxgb3i_iscsi_cleanup(void)
1012 {
1013         if (cxgb3i_scsi_transport) {
1014                 cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
1015                                  cxgb3i_scsi_transport);
1016                 iscsi_unregister_transport(&cxgb3i_iscsi_transport);
1017         }
1018 }